@article{oai:iwate-u.repo.nii.ac.jp:00009017,
 author = {國崎, 貴嗣 and 松井, 沙織},
 journal = {岩手大学農学部演習林報告},
 month = {Jun},
 note = {本研究の目的は,高密なスギ高齢人工林1林分を対象にデータ解析し，個体の胸高直径相対
成長率と相関の高い指標を抽出すること，抽出された指標を活用して主伐候補木の選定基準を一つ提案することである。Spearmanの順位相関係数から，胸高直径相対成長率(RD) と有意な相関が認められたのは，樹冠長，樹冠長率，胸高直径，形状比であった。このなかで最も相関係数の絶対値が大きいのは形状比であった。線形モデル分析の結巣，説明変数として形状比を含むモデルのAICが小さい傾向にあった。RDの0.01分位点を応答変数，形状比を説明変数とした分位点回帰により，形状比が74.9のときにRDの0.01分位点は0になると推定された。高密高齢林から主伐候補木を選定する一つの基準として，冠雪害の耐性基準値である形状比70未満を用いることは有効であると推察される。, In this study, we selected a principal variable correlated to the relative increment of
diameter at breast height (DBH) of old Sugi ( Cryptomeria japonica D. Don) and
propose a convenient index of individual-based management for dense plantations of the tree. The variables from two crowns and three stems were used in the correlation and regression procedures to model the relative increment of DBH of individual trees in an old Sugi stand. For the analysis, we used data from tree censuses spanning 11 years, beginning when the stand was 153 years old. Spearman's rank correlation analysis
revealed that crown length, crown length-height ratio, and DBH were positively correla ted. On the other hand, the height-DBH ratio was negatively correlated with the
relative DBH increment of the trees. The absolute value of the correlation coefficient of
the height-DBH ratio was the greatest among the variables. Linear model analysis
revealed that the Akaike Information Criterias (AICs) of models using the height-DBH
ratio as a predictor variable were less than those of models without this ratio as a
predictor variable. The lower limit of the relative DBH increment tended to decrease
with the height-DBH ratio, which could be described by the 0.01 quantile regression line
and was estimated to be zero when the height-DBH ratio equaled 74. 9. In conclusion,
leaving trees with a height-DBH ratio < 70 in dense plantations of old Sugi is effective
in preventing snow accretion damage and ensuring the durability of stem growth.},
 pages = {45--56},
 title = {粗放管理されたスギ高齢林における簡便な個体管理指標の探索},
 volume = {42},
 year = {2011}
}